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B1861 Toyota Code - Open in Driver Side Knee Airbag Squib Circuit

Quick Answer

The B1861 code for Toyota vehicles indicates an open in the driver side knee airbag squib circuit. Common causes include Damaged wiring or connectors in the driver side knee airbag circuit, A faulty driver side knee airbag squib, Corrosion or contamination in the circuit components. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1861 Toyota indicates Open in Driver Side Knee Airbag Squib Circuit.
Common causes
Common causes include Damaged wiring or connectors in the driver side knee airbag circuit, A faulty driver side knee airbag squib, Corrosion or contamination in the circuit components.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code B1861 Toyota Description

The B1861 code for Toyota vehicles indicates an open in the driver side knee airbag squib circuit. This means that there is a malfunction in the circuit that controls the deployment of the driver side knee airbag. The squib is an electrical component that initiates the deployment of the airbag in the event of a collision. When there is an open circuit, it means that the electrical current is unable to flow properly, which can prevent the airbag from deploying when needed.

OBDII Code B1861 Toyota - Open in Driver Side Knee Airbag Squib Circuit
B1861 Toyota Code - Open in Driver Side Knee Airbag Squib Circuit

Common Causes of B1861 Toyota

  1. Damaged wiring or connectors in the driver side knee airbag circuit.
  2. A faulty driver side knee airbag squib.
  3. Corrosion or contamination in the circuit components.
  4. Impact damage to the airbag system from a previous collision.
  5. Electrical issues in the vehicle's overall wiring system.

Symptoms of B1861 Toyota

  1. The airbag warning light on the dashboard may illuminate.
  2. The driver side knee airbag may fail to deploy in a crash.
  3. The vehicle may fail an airbag system diagnostic test.
  4. There may be a stored fault code related to the driver side knee airbag squib circuit.

How to Fix B1861 Toyota

  1. Begin by diagnosing the specific cause of the open circuit using a diagnostic scanner.
  2. Inspect the wiring and connectors in the driver side knee airbag circuit for damage or corrosion.
  3. Test the driver side knee airbag squib to determine if it is functioning correctly.
  4. Replace any damaged wiring, connectors, or the faulty squib as needed.
  5. Clear the fault code and test the airbag system to ensure proper functionality.

Cost to Fix B1861 Toyota

The typical repair costs for addressing an open in the driver side knee airbag squib circuit on a Toyota vehicle can range from $200 to $500, including parts and labor. However, it's important to note that prices can vary depending on the specific model of the vehicle, the location of the repair shop, and the extent of the damage. Additionally, diagnostic time and labor rates can impact the overall cost, with rates typically ranging from $80 to $150 per hour. It's recommended to consult with a qualified mechanic or repair shop to get an accurate estimate based on your individual circumstances.

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Information for Specific Toyota Models

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1861 Toyota Code

1. What are the common symptoms of OBDII code B1861 in a Toyota related to an open in the driver side knee airbag squib circuit?

- The common symptoms include the airbag warning light illuminating on the dashboard and a potential loss of functionality of the driver side knee airbag.

2. What are the possible causes of OBDII code B1861 indicating an open in the driver side knee airbag squib circuit in a Toyota?

- The code may be triggered by a damaged or loose wiring harness, a faulty airbag squib, or a poor electrical connection.

3. How can I diagnose the issue causing OBDII code B1861 in my Toyota indicating an open in the driver side knee airbag squib circuit?

- A thorough inspection of the wiring harness, connectors, and airbag squib is recommended. Using a multimeter to test for continuity and proper voltage can help pinpoint the issue.

4. Can I still drive my Toyota with OBDII code B1861 indicating an open in the driver side knee airbag squib circuit?

- It is not recommended to drive the vehicle with this code present, as it may compromise the functionality of the driver side knee airbag in the event of a collision.

5. How can I repair OBDII code B1861 related to an open in the driver side knee airbag squib circuit in my Toyota?

- The repair typically involves fixing the damaged wiring, replacing the faulty airbag squib, or addressing any loose connections. It is advisable to seek professional help for proper repair.

6. Is it safe to reset the OBDII code B1861 in my Toyota without addressing the underlying issue of an open in the driver side knee airbag squib circuit?

- Resetting the code without fixing the root cause may temporarily turn off the warning light, but it will not resolve the safety issue with the airbag system. It is important to address the issue promptly.

7. How much does it typically cost to repair OBDII code B1861 indicating an open in the driver side knee airbag squib circuit in a Toyota?

- The cost of repair can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates at the repair facility. It is advisable to obtain quotes from trusted mechanics.

8. Can a DIY enthusiast with automotive knowledge fix OBDII code B1861 related to an open in the driver side knee airbag squib circuit in a Toyota?

- While some aspects of the repair, such as checking for loose connections, can be done by a DIY enthusiast, working on the airbag system requires specialized skills and knowledge. Professional assistance is recommended.

9. Will OBDII code B1861 prevent my Toyota from passing a vehicle inspection or emissions test?

- In most regions, a lit airbag warning light will cause a vehicle to fail inspection due to safety concerns. It is advisable to address and repair the issue indicated by the code before undergoing any tests.

10. How long does it take to repair OBDII code B1861 indicating an open in the driver side knee airbag squib circuit in a Toyota?

- The repair time can vary based on the specific cause of the issue, availability of parts, and the expertise of the technician. It is recommended to consult with the repair shop for an estimated timeframe.

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